Peer-reviewed articles 17,970 +


Title: ON NON-CONFORMITY OF THE CLASSIC REACTOR KINETICS TO PHYSICS OF A CHAIN REACTION
ON NON-CONFORMITY OF THE CLASSIC REACTOR KINETICS TO PHYSICS OF A CHAIN REACTION

PlumX Article Metrics by Elsevier
N. Oshkanov
10.5593/sgem2018/4.1/S16.006
1314-2704
978-619-7408-44-7
English
18
4.1
Nuclear Technologies
Background: In the classical kinetics theory of a nuclear reactor, inserting the slightest reactivity-jump leads to an unlimited exponential increase in the reactor power. The purpose this study is the establishment of the nature of such a phenomenon.
Methods: Theoretical research is based on the physics of the chain fission reaction as a sequence of cycles, each cycle of which is initiated by neutrons of the previous cycle. The study method consists in determining the change in the output neutron density of the cycle sequence under the reactivity-jump action.
Results: It is established that the delayed neutron lifetime does not exceed the cycle duration in which they are born. This is fundamentally different from the classical statement that this time is large (several tens of thousands of cycles). The kinetics equations of the sequence of chain reaction cycles are derived. The solution of these equations for the reactivity jump of a less effective fraction of delayed neutrons shows a limitation of the neutron density by a stable level, and not an unlimited growth. It is established that this limitation is due to a previously unknown feedback on the rate of change in the density of delayed neutron precursors.
Conclusions: An analysis of the solution of the derived kinetic equations and the fact that the lifetime of delayed neutrons does not exceed the lifetime of the cycle in which they are generated allows us to conclude that there is a previously unknown feedback with respect to the rate of change in the density of precursors of delayed neutrons. This feedback leads to self-regulation of the reactor power when inserting a positive reactivity of a less effective fraction of delayed neutrons. The results of the study indicate the need to revise the classical theory of the kinetics of a nuclear reactor.
conference
https://www.sgem.org/index.php/jresearch-article?citekey=Oshkanov2018163946
Download PDF
18th International Multidisciplinary Scientific GeoConference SGEM 2018
18th International Multidisciplinary Scientific GeoConference SGEM 2018, 02-08 July, 2018
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference-SGEM
Bulgarian Acad Sci; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Slovak Acad Sci; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; World Acad Sci; European Acad Sci, Arts & Letters; Ac
39-46
02-08 July, 2018
website
cdrom
1099
reactor kinetics; lifetime of delayed neutrons; self-regulation of reactor power